Impulse welding bar with non-stick coating

Abstract

An impulse welding bar (10) for welding plastics films is provided with a detachable non-stick coating (20) which is held on lateral flanks (24) of the impulse welding bar (10). In order to facilitate the replacement of a worn non-stick coating (20), retaining elements (22) are provided which are made of two or more parts and which act in a form-fitting manner in order to detachably fasten the non-stick coating (20) to both flanks (24) of the impulse welding bar (10), wherein first parts (26) of the retaining elements (22) are arranged on the flanks (24) of the impulse welding bar (10) and second parts (36) of the retaining elements (22) are arranged on the non-stick coating (20).

Description

RELATED APPLICATION[0001]This application claims the benefit of priority of German Patent Application No. 10 2020 111 524.5 filed on Apr. 28, 2020, the contents of which are all incorporated by reference as if fully set forth herein in their entirety.FIELD AND BACKGROUND OF THE INVENTION[0002]The present invention relates to an impulse welding bar for welding plastics films, comprising a detachable non-stick coating which is held on lateral flanks of the impulse welding bar.[0003]Impulse welding bars for film welding have typical lengths of approx. 200 mm to more than 2,500 mm. They must be provided with a non-stick coating so that the welded seam is able to detach from the heating element. The non-stick coating is usually glued laterally. Some designs use complex mechanical fasteners.[0004]A typical non-stick coating is designed as a PTFE glass fabric, which is self-adhesive in parts on its rear such that it can be glued directly to the impulse welding bar. There must be no adhesiv...

AI Technical Summary

Benefits of technology

The patent text discusses the use of recesses and retaining elements on an impulse welding bar to improve the installation and alignment of a non-stick coating. The retaining elements can be designed as snap fasteners or grip seal strips. The use of a heat-resistant support can also be beneficial to protect the area stressed by the pulse welding tape. These features can make the assembly process easier, reduce the likelihood of wrinkles or stresses, and facilitate the replacement of worn non-stick coatings.

Problems solved by technology

Gluing the first parts of the retaining elements to the flanks of the impulse welding bar is unproblematic, as they remain on the impulse welding bar even when a worn non-stick coating is replaced, and therefore no cleaning work has to be carried out during a regular, wear-related replacement of the non-stick coating.

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